net: Cap number of elements for sendmmsg
To limit the amount of time we can spend in sendmmsg, cap the number of elements to UIO_MAXIOV (currently 1024). For error handling an application using sendmmsg needs to retry at the first unsent message, so capping is simpler and requires less application logic than returning EINVAL. Signed-off-by: NAnton Blanchard <anton@samba.org> Cc: stable <stable@kernel.org> [3.0+] Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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